Substitution Property of Equality

Pronunciation: /ˈsʌb stɪˌtut ʃən ˈprɒp ər ti ʌv ɪˈkwɒl ɪ ti/ Explain

The substitution property of equality that, if a = b, then b can be substituted for a in any equation without changing the truth value of the equation. For example:

  • Let a = b.
  • Let d = a + 2.
  • Then d = b + 2.


  1. substitution. Encyclopedia Britannica. Merriam-Webster. Last Accessed 3/12/2009.

Cite this article as:

McAdams, David E. Substitution Property of Equality. 5/5/2011. All Math Words Encyclopedia. Life is a Story Problem LLC.

Revision History

12/24/2008: Added concept of 'truth value' of an equation. (McAdams, David E.)
7/1/2008: Initial version. (McAdams, David E.)

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